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Determine the residual ISI at the output of the equalizer for the optimum tap coefficients.
Determine the output of the demodulator at t = T and t = 2T that employs a filter matched to s(t).
Determine qm for m = ±2, ±3, by convolving the impulse response of the equalizer with the channel response.
Determine the possible output levels at the detector, assuming that successive transitions can occur at the rate 1/Tb.
The received sequence {yn} is processed by a linear three-tap equalizer that is optimized on the basis of the MSE criterion.
Evaluate and compare the exact values of the output SNR for the three-tap and infinitetap DFE in the special cases where N0 = 0.1 .
This pulse is used for transmitting digital information over a band-limited channel at a rate 1/T symbols/s.
How many surviving sequences are there in the Viterbi algorithm for this channel?
The Nyquist criterion gives the necessary and sufficient condition for the spectrum X( f ) of the pulse x(t) that yields zero ISI.
Select a symbol rate and a power efficient constellation size to achieve 9600 bits/s signal transmission.
Design an M-ary PAM system that transmits digital information over an ideal channel with bandwidth W = 2400 Hz.
Consider the transmission of data via PAM over a voice-band telephone channel that has a bandwidth of 3000 Hz.
A precoder for a partial response signal fails to work if the desired partial response at n = 0 is zero modulo M.
The binary sequence 10010110010 is the input to a precoder whose output is used to modulate a duobinary transmitting filter.
The ISI term is a random variable that takes the values -1 2 , 0, and ½ with probabilities ¼ , ½ , and ¼ , respectively.
If the signal pulse used is rectangular, determine the loss in SNR due to the mistiming.
Determine the output of the matched filter at t = kT , k = 0, ±1, ±2, ... , where T is the symbol duration.
What is the highest bit rate that can be transmitted without ISI?
A channel is said to be distortion less if the response y(t) to an input x(t) is K x(t - t0), where K and t0 are contants.
To reduce the level of inter symbol interference to a relatively small amount, we impose the condition that x(T ) = 0.01, where T is the symbol interval.
Generate 5000 samples of the digital signal sequence xd (n) and compute and plot the power spectral density of this modulated signal.
A 4-kHz band pass channel is to be used for transmission of data at a rate of 9600 bits/s. If ½ N0 = 10-10 W/Hz is the spectral density.
Determine the bit rate that can be transmitted through a 4-kHz voice-band telephone (bandpass) channel if the modulation methods .
Design an M = 4 PSK (quadrature PSK or QPSK) system for transmitting data at a rate of 2400 bits/s and a carrier frequency fc = 1800 Hz.
A voice-band telephone channel passes the frequencies in the band from 300 to 3300 Hz. It is desired to design a modem that transmits at a symbol rate of 2400.